E39 Non-M Sedan Polyurethane Rear Trailing Arm Bushings (RTAB) - 33321091335 / 33321091336 , 33326757315 / 33326757316

E39 Non-M Sedan Polyurethane Rear Trailing Arm Bushings (RTAB) - 33321091335 / 33321091336 , 33326757315 / 33326757316 Description The BMW E39, known for its balance of comfort, build quality, and excellent driving dynamics, continues to be a popular choice of mid-size sedan amongst driving enthusiasts. As these vehicles age, suspension components such as the rear trailing arm bushings (RTAB) — also referred to as rear lower swing arm bushings — often wear out, negatively affecting handling and ride quality. Replacing these with polyurethane bushings has become a common upgrade in recent years, offering several performance benefits over OEM rubber counterparts. Why Upgrade to Polyurethane? OEM rubber bushings are designed to absorb vibrations and allow controlled flex / toe-in under load. However, they degrade over time, leading to excessive and unwanted suspension movement, imprecise handling, and uneven tire wear. Polyurethane bushings, by contrast, provide greater stiffness and dura